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The protection outlet circuit of 555 small-sized fridge

2016-09-27 11:28  
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The protection outlet circuit of 555 small-sized fridge
The circuit is based on 555, which has the virtues of small size, low cost and reliable time delay. The circuit consists of step-down rectifier circuit, time delay circuit and relay controller circuit, etc, which is as shown in Figure 13-21. The step-down rectifier circuit consists of step-down capacitor C1,C2 and full bridge circuit QD, C2 and so on , the rectified voltage is stabilized by R2 and DW and then becomes a DC voltage of +9V, finally, it becomes the working voltage of the next circuit.555,C4 ,R3 and so on consist a single steady time delay circuit. Figure 13-21 The protection outlet circuit ofthe small-sized fridge